UPDATE 1-LA attorneys distance Polanski from French lawyer

* French lawyer says Polanski will fight extradition

* US attorneys say French atty's comments unauthorized

* Polanski said to be holding up well in prison (Updates with statement from Los Angeles attorneys)

PARIS/LOS ANGELES, Nov 20 (Reuters) - A French attorney for Roman Polanski who said the film director would not return voluntarily to the United States to face child sex charges is not authorized to speak in the case, Polanski's U.S. attorneys said on Friday.

Polanski, 76, is being held in a Swiss prison pending a decision on a U.S. extradition request. He fled the United States in 1978 while awaiting sentencing for having unlawful sex with a 13-year-old girl, and he was arrested in September in Switzerland on a U.S. warrant.

The director's French lawyer, Herve Temime, told Le Figaro newspaper in an interview published on Friday that Polanski would not return voluntarily to the United States. But Los Angeles attorneys Douglas Dalton, Bart Dalton and Chad Hummel said in a statement that Temime's comments were not authorized by Polanski.

"The French lawyers do not represent him in the case and do not speak for him about it," the statement said.

The statement said only the three Los Angeles lawyers, along with Dr. Lorenz Erni in Switzerland and Polanski himself "are authorized to speak on his behalf" about the case.

A spokeswoman for the Los Angeles lawyers declined to comment beyond the statement.